What could be the possible reason for formation of ice on my AC's evaporator coil (i.e., the front grill) ??

Question

At times when my AC run for few hours, there is a formation of ice
on the evaporator coil and condenser coil...and coz of it there is no throw of cool air..pls help me to fix this problem.

Answer 1

This can occur when 1) several things come together at the same time, or 2) can occur due to lack of air flow alone, or in the worst case, it 3) can be caused by being low on freon.

Once the ice builds up, it restricts the air flow which in turn causes more ice. It's a death spiral that can only be solved by turning off the compressor. You can leave the fan running, and in fact, that will help to get the ice melted a bit faster.


1) As for the convergence of events -- if you live in an exceptionally humid area and have had to run your A/C nearly constantly to keep things cooled down, some poorly designed units will ice up on you even if your air flow is not restricted -- just because the air flow isn't adequate to start with or the unit wasn't fully charged as delivered.

2) You need to be certain that there is no restriction of air anywhere in the system. Check outside to assure the fins are clean and mostly straight, check inside to be sure nobody has built a nest in your unit (!) over the winter, and check to be sure you have a clean filter installed. *Anything* that impedes air flow can cause this problem.

3) Last, being *low* on freon (vs. "overcharged" as suggested above) can cause this same problem. If you're certain you've got everything clear for air flow, you'll need to have that checked.

Answer 2

Usually there are two reasons the A/C freezes,

1.Dirty air filter or clogged fins on the evaporator or condenser Change filter or hose off evaporator or condensor.
2.Low on refrigerent. Might need to "charge system". By a qualified service person.

Answer 3

probably overcharged or possibly stuck expansion valve

Answer 4

Your system is low on freon.

Answer 5

i thought they all did that?